package com.bite;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Temp {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
    // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String str1 = in.nextLine();
            String str2 = in.nextLine();
            func(str1, str2);
        }
    }

    public static void func(String str1, String str2) {
        str1.toUpperCase();
        str2.toUpperCase();
        int k = 0;
        Set<Character> set = new HashSet<>();
        Set<Character> set2 = new HashSet<>();
        for(int i = 0; i < str1.length(); i++){
            set.add(str2.charAt(i));
        }
        for(int i = 0; i < str1.length(); i++){
            if(!set.contains(str1.charAt(i)) && !set2.contains(str1.charAt(i))){
                set2.add(str1.charAt(i));
                System.out.println(str1.charAt(i));
            }
        }
    }
}
